sysdeps/unix/sysv/linux/getrlimit64.c

   1 /* Linux getrlimit64 implementation (64 bits rlim_t).
   2    Copyright (C) 2010-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <sys/types.h>
  21 #include <sysdep.h>
  22 #include <shlib-compat.h>
  23
  24 /* Add this redirection so the strong_alias for __RLIM_T_MATCHES_RLIM64_T
  25    linking getrlimit64 to {__}getrlimit does not throw a type error.  */
  26 #undef getrlimit
  27 #undef __getrlimit
  28 #define getrlimit getrlimit_redirect
  29 #define __getrlimit __getrlimit_redirect
  30 #include <sys/resource.h>
  31 #undef getrlimit
  32 #undef __getrlimit
  33
  34 /* Put the soft and hard limits for RESOURCE in *RLIMITS.
  35    Returns 0 if successful, -1 if not (and sets errno).  */
  36 int
  37 __getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
  38 {
  39   return INLINE_SYSCALL_CALL (prlimit64, 0, resource, NULL, rlimits);
  40 }
  41 libc_hidden_def (__getrlimit64)
  42
  43 #if __RLIM_T_MATCHES_RLIM64_T
  44 /* If both rlim_t and rlimt64_t are essentially the same type we can use
  45    alias both interfaces.  */
  46 strong_alias (__getrlimit64, __GI_getrlimit)
  47 strong_alias (__getrlimit64, __GI___getrlimit)
  48 strong_alias (__getrlimit64, __getrlimit)
  49 /* Alpha defines a versioned getrlimit{64}.  */
  50 # ifndef USE_VERSIONED_RLIMIT
  51 weak_alias (__getrlimit64, getrlimit)
  52 weak_alias (__getrlimit64, getrlimit64)
  53 libc_hidden_weak (getrlimit64)
  54 # else
  55 weak_alias (__getrlimit64, __GI_getrlimit64)
  56 # endif
  57
  58 #elif SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_2)
  59 /* Back compatible 2GiB limited rlimit.  */
  60 extern int __new_getrlimit (enum __rlimit_resource, struct rlimit *)
  61   attribute_hidden;
  62
  63 int
  64 attribute_compat_text_section
  65 __old_getrlimit64 (enum __rlimit_resource resource, struct rlimit64 *rlimits)
  66 {
  67   struct rlimit rlimits32;
  68
  69   if (__new_getrlimit (resource, &rlimits32) < 0)
  70     return -1;
  71
  72   if (rlimits32.rlim_cur == RLIM_INFINITY)
  73     rlimits->rlim_cur = RLIM64_INFINITY >> 1;
  74   else
  75     rlimits->rlim_cur = rlimits32.rlim_cur;
  76   if (rlimits32.rlim_max == RLIM_INFINITY)
  77     rlimits->rlim_max = RLIM64_INFINITY >> 1;
  78   else
  79     rlimits->rlim_max = rlimits32.rlim_max;
  80
  81   return 0;
  82 }
  83 versioned_symbol (libc, __getrlimit64, getrlimit64, GLIBC_2_2);
  84 compat_symbol (libc, __old_getrlimit64, getrlimit64, GLIBC_2_1);
  85 #else
  86 weak_alias (__getrlimit64, getrlimit64)
  87 libc_hidden_weak (getrlimit64)
  88 #endif /* __RLIM_T_MATCHES_RLIM64_T  */